Fileseek - Omron NY532-5400 Reference Manual

FileSeek

The FileSeek instruction sets a file position indicator in the specified file in the SD Memory Card.
Instruction
FileSeek Seek File
Variables
Name Meaning
FileID File ID
Offset Offset
Origin Reference
position
Bit strings
FileID
Offset
Origin Refer to Function for the enumerators for the enumerated type _eFSEEK_ORIGIN.
Function
The FileSeek instruction sets a file position indicator in the file specified by file ID FileID in the SD Mem-
ory Card. A file position indicator is the position in a file at which to start reading or writing when an
instruction such as the FileRead or FileWrite instruction is executed. For example, to read from the
beginning of a file, set a file position indicator at the beginning of the file with the FileSeek instruction,
and then execute the FileRead instruction. The file position indicator is set at offset Offset from refer-
ence position Origin.
The data type of Origin is enumerated type _eFSEEK_ORIGIN. The meanings of the enumerators are
as follows:
Enumerator
_SEEK_SET Beginning of file
_SEEK_CUR Location of current file position indicator
_SEEK_END End of file
NY-series Instructions Reference Manual (W560)
Name FB/FUN
FB
I/O Description
ID of file in which to set file
position indicator
Offset from Origin
Input
Reference position for file
position indicator
OK
Meaning
Graphic expression
FileSeek_instance
FileSeek
Execute Done
FileID Busy
Offset Error
Origin ErrorID
Valid range
Depends on data type.
_SEEK_SET,
_SEEK_CUR, or
_SEEK_END
Integers
OK
2 Instruction Descriptions
ST expression
FileSeek_instance(Execute,
FileID, Offset, Origin, Done,
Busy, Error, ErrorID);
Unit Default
---
0
Bytes
_SEEK
---
_SET
Times, durations, dates,
and text strings
2-1261
2